sql-server - 存储过程帮助：将年份作为参数传递以获取结果

Question

我试图基本上输入一年（不是整个日期）来获取一组结果，这些结果将告诉我今年售出的物品数量。但是，我不确定如何去做。下面是我所拥有的一个例子。

ALTER PROC OrderYear
(@OrderYear datetime)
AS

SELECT Orderdate as [Year],COUNT(SalesOrderID) as Count
FROM Sales.SalesOrderHeader
WHERE @OrderYear=YEAR(OrderDate)
GROUP BY OrderDate

BEGIN
SET NOCOUNT ON
END

EXEC OrderYear '2005'

Answer 1

您想将查询谓词表示为一个范围，因为范围是 sargable：

SELECT Orderdate as [Year],COUNT(SalesOrderID) as Count
FROM Sales.SalesOrderHeader
WHERE OrderDate >= @firstDayOfYear AND OrderDate <= @lastDayOfYear
GROUP BY OrderDate;

所以诀窍是计算给定年份的@firstDayOfYear和。@lastDayOfYear我将把它作为练习留给读者。

Answer 2

程序没问题，改变输入参数的类型：

ALTER PROC OrderYear
(@OrderYear int) 
AS
SELECT Orderdate as [Year],COUNT(SalesOrderID) as Count
FROM Sales.SalesOrderHeader
WHERE @OrderYear=YEAR(OrderDate)
GROUP BY OrderDate